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HUAWEI MG323 GSM M2M Module
Hardware Guide
Description of the Application Interfaces
Issue 04 (2011-08-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
15
3.4 Power-On and Power-Off Time Sequence
3.4.1 Overview
The power-on, power-off, and reset control parts of the B2B interface of the MG323
module includes power-on/power-off interface signal (TERM_ON) and the hardware
reset interface signal (RESET). Table 3-2 lists the definitions of the interface pins.
Table 3-2 Definitions of pins of the power-on/power-off and reset interfaces
Pin No.
Signal Name
I/O
Description
20
TERM_ON
I
Pin for controlling power-on and
power-off
22
RESET
I
Pin for resetting the hardware
3.4.2 Power-On Time Sequence
Make sure that the MG323 module is powered on at the voltage and working
temperature in the recommended range. Otherwise, the module may get
damaged or work improperly.
External application interfaces must be powered on after the module is powered
on.
You can power on the MG323 module through the TERM_ON interface. The software
will report relevant information according to the actual settings after the module is
powered on. For example, the AT command automatically reports ^SYSSTART[1]. In
this case, the external VIO interface is enabled and supplies 2.8 V power.
[1] For specific setting information about the power-on/power-off software, see the HUAWEI
MG323 GSM M2M Module AT Command Interface Specification.
Figure 3-3 shows the power-on time sequence.